The fund must be either in, or ready for, retirement. For a fund to be in retirement,
then the retirement flag must be set. For a fund to be ready for retirement, then:
it must not already be in retirement;
the amount of raised funds must be bigger than the free balance of the account;
and either:
the block number must be at least end; or
the current lease period must be greater than the fund's last_period.
In this case, the fund's retirement flag is set and its end is reset to the current
block number.
who: The account whose contribution should be withdrawn.
index: The parachain to whose crowdloan the contribution was made.
Withdraw full balance of a specific contributor.
Origin must be signed, but can come from anyone.
The fund must be either in, or ready for, retirement. For a fund to be in retirement, then the retirement flag must be set. For a fund to be ready for retirement, then:
end; orlast_period.In this case, the fund's retirement flag is set and its
endis reset to the current block number.who: The account whose contribution should be withdrawn.index: The parachain to whose crowdloan the contribution was made.